Polyphase commutator-motor.



v. A'. PYNN.

POLYPHASE GOMMUTATOR MOTOR.

APPLICATION FILED JUNE 1, 1909.

960,883. Patented June 7, 1910.

w/r/vfssfs: 4 v vf/vroe Pz Valero A. Fynn i', C WML. l By n v. A. FYNN. POLYPHASE GOMMUTATOB. MOTOR.

APPLICATION FILED JUNE lI 1909. l 960,883, Patented June?,l 1.910.

I WIT/VESSES I F v n Valre A. ynn.

ATTORNEYS .nanngnmurmnmpmmc ings, forming' part of satisfactoril UNiTED srnrEs rrENT oEEicE.

vALnn ALFRED EYNN, or LONDON, ENGLAND.

POLYPHASE COllIlvIUTATORMOTOR.

Specification of 'Letters Patent.

Patented J une 7, 1910..

Application led June 1, 1909. Serial No. 499,465.

' FrNN, .a subject ofthe King of England,

residing at London, England, have invented a certain n'ew and useful Poly phase Conn'nutator-Motor, of which the following is such a full, clear, and exact description as will enl able anyone skilled in the art to which it appertains to make and use the same, rcference being had to the accompanying dravof this speciiication.

My invention relates to polyphase coni- "inutator motors with a shunt characteristic.

Con-duction and induction motors of said type are known. and each is particularly adapted for operation at certain speeds,- thus the conduction -type I ind as a rule is more satisfactory in its operation when run at very low speedsand at speeds above synchronism whereas the induction type 1s often best atsynchronism and at speeds somewhat. below the synchronous.

. f l It is the object of my lnvention'to provide a variable speed polyphase motor capable operating vover a very wide range of spee Other vobjects are to control the power y factor of such motors and to simplify their sired.

construction.

I achieve my lirst object byso constitut ingfmy motor that it -can be operated either as a conduction or as an induction motor `or` as a combination of both types without it being necessary toLchange the connections or to disconnect the motor lfrom the mains, the transition from one style of operation to any other being as gradualas'may be de-l I control the power factor by combining 'phase compensating devices with my former windlng2 or as a fieldwindin motor and IY simplify its construction by making use of' only one stator winding per phase. I utilize this stator winding asl a neutralizing winding only `or as a transor as afield and compensating winding or, or two or more of these duties simultaneohsly, and

vI so'varrangrn'y circuit that the rotor'winding along the corresponding axis can when deslred be utilized for the same purposes.

In the acc'ompanyint'g diagrammatic drawmgsl which-show two-pole embodiments of- Iny invention,y Figure l is notan operative combination-but simply illustrates the lead- Y ingpidealA underlying invention as api l I -l and adapted for speed regulation, whereas Fig. 3 shows machine.

Referrging to Fig. l, the working circuit 60 comprises the stator winding 8 to= which I* willv hereinafter refer as the neutralizing wiiiding although it does not always or exclusively act as such, and the coniniuted winding l1. The two are coaxially connejctcd in seri-esl and in opposition by way f iii the brushes 9, 10 and an E. M. F. P1 dehjrvejl from the mains l, 2 by way of the lltransformer 1T is impressed on this working circuit as a whole. A point C intermediately situated with respect to the two windings forming the working circuit of this phase is connected to some point D ofy that transformer winding 19 which feeds the i working circuit and an auxiliary or con pensating E. -M. F. P2 differing in phase from P1 is impressed on the conductor oonnecting points I) and' C, or in other words, is included-between D and C in the preferred foi-iii of my motor. This auxiliary E. M. F. P2 may be a single F. or the resultant of a number of E. M. Fs. of differing phases. In Fig. l it is supposed to be der'ved by way ofthe transformer 20 from the second phase 3, 4, of a two-phase supply.

The nature of the motor, provided of course that the scheme shown in Fig. l is applied to a polyphase. machine, will depend on the-position of point I), z'. e., of 9o contact 15, relatively to points A and B of i9. Thus when 15 stands at A then 8 is short-circuited or is closed on a part of 22 according to thel position `of contact- 1.6. Vlien S is short-circuited the machine opcrates as a' noncompensated motor and when 8 -is closed on 22 then it operates as a coina corresponding. three-phase pensatedmotor. When l5 stands on B the motor operates as an induction motor and the machine is compensated ing to whether' a'part `of 22 is included in the brush circuit. When 15 stands approximately in the position' shown in Fig. l then rthe machine .operates as a neutralized conduction 1notor,.the working circuit being `105 supplied from the points A, B and Sdoing duty not only as a neutralizing winding but also as a eld'and compensating winding,

or not accord 100 the exciting E. M. F impressed on S being derived from 19 and the com)ensatn'wr or b auxiliary L. h1. F. from QQ. 1n other positions ot 15 the motor operates partly as a conduction and partly as an induction motor. By suitably displacing the various con- ,tacts I can therefore not only alter tliespeed of my machine but also change the nature ot i contact- 15 relatively to the positionso't contacts 13 and 14C. rhe speed can also be va! ried by varying the E. M. F. derived 4from 19 and impressed on the working circuit as a whole. This can be achieved by moving both or eitler of the contacts 13 and 1l. The poiver factor the motor can be varied by varying the E. M. F. derived from 92 and impressed on the exciting circuit. @ne of the contacts 13 or lLl can be omitted.

Referring to the tivo-phase motor shovvn in Fig. 2, one of the Working circuits comprises the neutralizing Winding S and the commuted Winding 11 by Way of' the brushes 9, 10 and is fed from the mains 1, 2 b v Way of the transformer 17 With its primary 18 and secondary 19. The E'. il'. F. impressed on this first working circuit is derived from 19 at points 13, and 11. It can be regulated at 1st and reversed at A point C, intermediately situated between the windings 8 and 11 is regulatably connected to some point of 19, for instance at 15, but by way of the secondary 33 of the transformer 2O fed from the phase 3, 4.. The Contact 15 being connected to an intermediate point of 33 it is possible by means oit contact 1G not only to vary the magnitude but also the direction of the auxiliary E. M. F. derived from 3 3. This connection is of coursev equivalent in eii'ect to a reversing s\vitch,controlling The direction of the FTM. F. derived. from 19 and impressed on the circuit controlled by 15 depends on whether 15 stands above or below 14 or above or below B1. Similarly the second Working circuit comprises the neutralizing Winding QS and the commuted Winding 12 by Way of the brushes 26, '2T and is ted from the mains 3, 4 by Way of the transformer 2O vvitli its rimary 21 and secondary 30. The E. M.

impressed on this second Working circuitis derived from 3() at points B2 and 2in/it can be regulated at Q4 and reversed atY A point C2 intermediately situated between the windings 28 and 12 is regulatably connected to some point of 30 for instance at 29 but by way of the secondary 31 of the transformer 17 ted from phase 1, 2. The contact Q9 being connected to an intermediate point of 31 it is possible by means ot' contact 32 not only to vary the magnitude but also the direction ofthe E. M. F. derived from 31. The direction oit the E. M.

F. derived from 30 and impressed on the circuit controlled b v Q9 depends on whether 29 stands on the lett or on the right ot 2t or Whether it stands'on the lct't or the right 01"' B2.

ln Fic'. S :is shown an equivalent arrangement of a threephase motor. There are three transformers 3st, 35, 36 cach having tivo secondaries 40, 43 also ell, t1 and 42, 15. Ilfhese transformers are grouped in star connection. The Working circuits of the motor are also star connected, the neutral point lying Within the single commuted Winding 11 disposed on the rotor. The three neutralizing windings 47, 59 57 are coaxially and oppositely connected to the commuted \vinding by Way of thebrushes 48, and 58 respectively. The E. M. Fs. impressed on each of the three Working circuits as a ivhole are derived from the secondaries 10, ell and 42 respectively and depend t'or their magni# tude on the relative positions of contact 46 and point B1, ol. contact and point B2 and of contact 5G and point BT Intermediate points C1, C2, C3, of the three Working circuits are also .regulatably connected to these secondaries 10, t1, 4Q. at 19, ll and 59 but by Way respectively of ,the secondaries dat with contact 50, ot l5 with 'contact 55 and of 13 with contact (50. v

The direction of rotation in any of these motors is reversed in the usual manner by reversing the direction of the Working cur rent relativelyto that of the motor ield.

Having fully ,f/ described my invention, what I claim asureiv and desire to secure by Letters Patent' of'the United States is:

1. 1n a polyphase motor, at least two Working circuits each containing a neutralizing Windingo'n the stationary member and a commuted Winding on the revolving member, said windings being coaxially con nected in series relation, alseparate shunt transformer for connecting each of said Working circuits to the source of supply, and a separate conductor for each Working circuit connecting thetransformer 'feeding said circuit to a point on that circuit situated between the neutralizing Winding and the commuted Winding. y

2. In a polyphase motor, at least two Working circuits each containing a neutralizing Winding on the stationary member and a committed Winding on the revolving member, said windings being coaxially connected vin series relation, a separate adjustable ratio shunt transformer for connecting each of said working circuits to the source of supsituated between the'neutra-lizing winding and the commuted winding.

'3. Ina polyphase motor, at least two 'working circuits each containing a. neutralv. izing winding on the stationary member and 1olin. series relation, a separate adjustable ratio f l shunt transformer for connecting each of said working'circuits'to the .source of sup,- ply, andaseparate conductor for each worktact and connecting the transformer feeding a. commuted 'Winding o n the revolving meinber, said windings being coaxially connected ing circuit provided with a movable consaid circuit to a point on that circuit situated between the neutralizing winding and the cominuted winding. Y

` 4, In a polyphase motor, ai working cir- 1 cuit. for each phase containing a neutralizing Winding 'on the stationary member and a commuted winding on `the revolving member, said windings being coaxially connected I Ain series relation and in opposition to each other, a shunt transformer, the secoi'ioaryl Winding of said transformer being` provided with movable' contacts for connectingit to the working circuit, a conductor connecting a point on the working circuit situated between the neiiti'alizing winding and the comlmuted4 winding to one of said movablecontacts, and means for impressing on a part of .the working circuit an auxiliary E. M. F.

differing in phase from the E. M. F. im-

pressed on the working circuit as awhole.

5. In a polyphase motor, a working circuit for each phase containing a neutraliz- 'ing winding on the stationary member and a., commuted winding on the revolving member', said windings being coaxially connected in series relation and in opposition to each other, a shunt transformer, the secondary .winding of said transformer, being provided with movable 'contacts for connecting it to the working circuit, a conductor connecting a pointon the working circuit situated between the neutralizing winding and the commutcd winding to one of said movable contacts, and means for impressing on a part of the working circuit an auxiliary E. M. F. approximately in pbase quadrature to the AE. IWI. F. iinpressedon the working circuit asa whole.

6. In-a polyphase motor, a working cir- 1 cuit for eachphase containing a neutralizing winding on the stationary member and a coniiniited winding on the revolving meniber, said windings being coaxially connected in series relation and in opposition to each other, a shunt transformer, the secondary winding -of said transformer being provided with movable contacts for connecting it to the working circuit, a conductor con- 7. In a polypliase motor, a working circuit for each phase containing a neutralizing winding on the stationary member and a commuted winding on the revolving member, said windings being coaxially connected in 'series relation and in opposition to each other, a shunt transformer for connecting said working circuit to the source of supply, a conductor connecting the winding of the transformer to which the working circuit -is connected, to a point on that circuit situated between the neutralizing winding and the commuted winding, and means for impressing on part of the working circuit an auxiliary E. M. F. differing in phase from the E. M. F. impressed on the working circuit as a whole.

8. In a polyphasc motor, a working cir` cuit for each phase containing a neutralizing winding on the stationary member and a commuted winding on the revolvingl meniber, said windingsI being coaxially connected in series relation and in opposition to eachl other, a shunt transformer for connecting said working circuit to the source of supply,

a conductor connecting the winding of thel transformer to which the working circuit is connected, to a point onv that circuit situated between the neutralizing winding-and the cominutedwinding, and means for impressing on part of the working circuit an auxili iary E M. F. approximately in phase quadrature to the E. M. F. impressed on the working circuit as a whole.

9. In a polyphase motor, a working circuit for each phase containing a neutralizing winding on the stationary ineinbei and a cominuted winding onthe revolving member, said windings being coaXially connected in series relation and in opposition to each other, a shunt transformer connected to-tlie source of supply, movable contacts for con- 'necting the working circuit to the secondary winding of said transformer, a conductor connecting said secondary transformer winding to a point on the working circuit situated between the neutralizing winding and the coinmuted winding, and means for impressing on a part of the working circuit an auxiliary E. M. F. di'lferiiig in phase from the E. M. F. impressed on the working circuit as a whole.

10. In a polyphase motor, a working circuit for each phase containing a neutralizing winding on the stationary member and a commuted windingon the revolving member, said windings being coaxially connected in series relation and in opposition'to each other, a'shunt transformer connecting said working circuit to the source of supply, a

auxiliary E. M. F. differing in phase from the E. M. F. impressed on the working circuit as a whole.

, 11. In a polyphase motor, a working circuit for each phase containing a neutralizing Winding on the stationary member and a commuted Winding on .the revolving member, said windings being coaxially connected in series relation and in oppositionto each other, a shunt transformer connected to the source of supply, movable contacts for connecting the working circuit to the secondary Winding of said transformer, 'a conductor connecting said secondary transformer winding to a point on the-Working circuit situated between the neutralizing windingl and the commuted winding, and a second transformer for imnressmg on said conductor an v 'cuit for eac auxiliary E. M. F. differing in phase from the E. M..F. impressed on the working circuit as a Whole.

12. In a olyphase motor, a working cirli) phase containing a neutralizing Winding on the stationary member and a commuted winding onV the revolving member, said windings being coaxially connected in. series relation and in opposition to each other, a shunt transformer for connecting V said working circuit to the source of supply, a conductor connecting a point on thel working circuit situated between the neutralizing winding and the commuted winding to the winding of the transformer to which the working circuit is connected,` a second transformer for impressing on said conductor an auxiliary E. M. F. dlifering in phase from the E. M. F. impressed on the working circuit as a whole, and means for valr'lying the magnitude of said auxiliar E. M. In testimonyv whereof Il/iave hereunto set mvhand and aixed my' seal in the presence of the two subscribing witnesses.

- VALRE ALFRED FYNN. [La] Witnesses:

.- ELIZABETH BAILEY, E. E. HUFFMAN. 

